Gravitational Lensing in Galaxy Cluster Abell 1689

Abell 1689 is a massive galaxy cluster that has an impressive
number of gravitationally lensed background galaxies. In this
thesis more than 30 multiple image systems identified in A1689 are
used to derive an accurate mass profile for the cluster. It is also
shown how strong lensing in cluster can be used to constrain the
sizes of the dark matter haloes of cluster galaxies and to place
upper limits on the amount of dark substructure in clusters.